Keychron q3 (#16912)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Nick Brassel <nick@tzarc.org>
Co-authored-by: Cesar Rojas <cesar.fieoner@gmail.com>
Co-authored-by: lokher <lokher@gmail.com>
Co-authored-by: Adam Karim <adam@akarsoft.com>
Co-authored-by: bootstrapper <ido.samuelson@gmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

keyboards/keychron/common/keychron_common.h

@@ -0,0 +1,47 @@
+/* Copyright 2022 @ Keychron (https://www.keychron.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "stdint.h"
+#include "quantum_keycodes.h"
+
+enum custom_keycodes {
+    KC_MISSION_CONTROL = SAFE_RANGE,
+    KC_LAUNCHPAD,
+    KC_LOPTN,
+    KC_ROPTN,
+    KC_LCMMD,
+    KC_RCMMD,
+    KC_SIRI,
+    KC_TASK_VIEW,
+    KC_FILE_EXPLORER,
+    KC_SCREEN_SHOT,
+    KC_CORTANA
+};
+
+#define KC_MCTL KC_MISSION_CONTROL
+#define KC_LPAD KC_LAUNCHPAD
+#define KC_TASK KC_TASK_VIEW
+#define KC_FLXP KC_FILE_EXPLORER
+#define KC_SNAP KC_SCREEN_SHOT
+#define KC_CRTA KC_CORTANA
+
+typedef struct PACKED {
+    uint8_t len;
+    uint8_t keycode[3];
+} key_combination_t;
+
+void housekeeping_task_keychron(void);
+bool process_record_keychron(uint16_t keycode, keyrecord_t *record);